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以分析纯ZrO2和WO3粉体为原料,采用分步固相法制备出ZrW2O8粉体,冷压成型并在1200℃下烧结4 h后炉冷、空气冷、水冷和液氮淬冷处理.采用X射线衍射仪(XRD)、扫描电镜(SEM)和热膨胀仪对合成样品的晶体结构、断面形貌和热膨胀性能进行表征.试验结果表明:随着冷却速度的增加,ZrW2O8分解为ZrO2和WO3的比例降低,随炉冷却制备的ZrW2O8完全分解为ZrO2和WO3;空冷制备的ZrW2O8.部分分解为ZrO2和WO3;在水和液氮中淬火得到纯ZrW2O8.在室温到600℃的测试区间内,采用空冷、水和液氮淬冷制备的ZrW2O8.的负热膨胀系数分别为-3.96×10-5K-1、-4.49×10-6 K-1和-5.95×10-6 K-1.

参考文献

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